# A273974 (b-file synthesized from sequence entry) 0 0 1 0 2 1 3 3 4 6 5 13 6 32 7 82 8 226 9 651 10 1939 11 5946 12 18637 13 59736 14 194898 15 645742 16 2167325 17 7359262 18 25237989 19 87325031 20 304549332 21 1069685013 22 3781189896 23 13443608964 24 48049822995 25 172568075048 26 622514907195 27 2254799747130